I guess I really am starting from the ground up. Before I can truly start to build my dream woodshop, I have to first do something about the crumbling concrete. In this video, I show you how I go about repairing my cracked and broken concrete floor.
Patching Cement I Used: https://amzn.to/3CYpGVv
A trick is to sweep up the garage floor and as the concrete patch is almost fully set up, just sweep the dirt through a few times. It hides your work a bit.
What kind of scraping tool is that you used?
What about some rust prevention then the solution here
I have a very similar crack and this video is the only one I could find that shows a similar gap. Thanks so much for posting, going to try this tomorrow!
Did you wait for the brushed-on part to dry before pouring the main part in?
Thanks for posting this!
Just curious, have you placed any direct loads on the patched area, like running your heavy toolbox casters over it?
Thanks for the vid bud
I can tell you have an older garage , as there are no expansion joints.
Rebar will rust when in contact with water. Concrete is porous
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That product is super liquid. How would i use that on a sloped driveway?
Put cornstarch in the mix to oxidize your portland and galb up the pores.
The crack will probably come back after some time because of the rusted rebar BUT, you can repair it perfectly the second time. After you have reached the rebar and remove the loose concrete, hammer the rebar hard on different points , so all the flaked rust breaks both from the rebar and old concrete, and also rebar decouples from the old concrete at some points. After that remove all the loose rust and debris. Get some white vinegar pour it all over the rebar, you can soak it if you can, or add some cloth on it and cover it with plastic so it won't dry out, leave it overnight. Next morning steel wire brush the rebar and vinegared area, wash it good, clean the dirt, and continue from the part that you brushed concrete mix as in the video. the crack will not come back for decades, if you do it this way.
Question, why did you wait for the first cement patch to cure instead of just quickly mixing and layering on some more?
Looks like you did a good job. I’m surprised you screed with your nice level. How has this patched area help up?
What happens when you try to clean it up at first and you hit sand? Does it mean that it should all be redone? Perhaps not enough cement to begin with?
The steel reinforcing takes on water, rusts and thus expands. It is this which causes the cracking on the concrete. Probably no membrane was used on the slab. Letting the slab breath by placing no waterproof layers on top of it as well as having no garden beds or black plastic up against it also helps keep water away. Water can move laterally by capillary action. In other words, clear the space around the slab so as to allow rain to be absorbed vertically (by gravity) in the soil surrounding the slab. If this doesn't happen, the steel reinforcing will rust further and you'll have a repeat of the same problem.
Great video, gonna finally redo my garage and gonna start w fixing a few spots in floor. Thanks
What would you use to patch on a incline or sloped floor? I would imagine that patching cement would run off before it dried.
how's it holdin today?
Thanks for this Video, its very useful to me as I want to do and area about .5 X 2m, so I wonder how this stands up to traffic such as machinery in my home workshop , any advice would be much appreciated thanks. Brian
With the rusty rebar, i was worried the water from the cement mix would cause that to rust more, but I think coating it helped.